Westco pump



2 SheetsSheet Fi1ed Feb. 3, 1964 INVENTOR AT0RNEY eXPlained in FI(}. 3.

Inited States Patent tried With conventional ZeStco puInpS to Ineef Such feqiTen1entS, it wi11 cauSe cavitation in the beginning poT tion of the v/ater paSSage of the funnef IT1eans. The cavitation feduceS tho pun1ping efficiency, caUSes efoSion of the Tunnef and giveS noiSe and vibration.

It has now becofne cleaT aS the TeSult of expeTiInental TeSearch, vVhat callSeS the cavitation. AS the sectional afea of the beginning poftion of the vvatef paSSa ge in the runnef n1eanS is far sInaller than that of the SI1ction oTt of the puInp, the speed of the cuffent becoIneS high and the pTeSSufe iS Teduced. The feduction of the pTeS Sufe iS further pToInoted by the fact that the ffuid iS StiTred Within the tooth spaces of the funner aTound the beginning poftion- ThoSe tWo factS callSe the cavitation. The sitllation of the pTeSSHTe Teduction iI1 the be ginning poftion of the water passage iS diagran1Inatically 1efefence SyInbols o, Z7, c and f TeSpectively Tefef to four pointS afound the beginning poftion of the wateT paSSa'ge (See FI(}. 1); IZ indicates neaSUTed pfeSSure values at each of the fo111 pointS; IIL indicateS the SUction head; and H fefeTs to the diSchaTge head, The diagfaIn, in vvhich pfeSSufe diffefence valueS Zf at each point zz, Z7 c of Z are plotted employing the diSchaTge head IICZ as a parafnetef, fepfesents cufves for ffle preSSufe characteTiSticS. AS is Teadily discefnible fToIn the diagraIn, at points o and o pTeSSure iS lovvef than H even When the diSchaTge pipe iS Shut off, and lowef than HS by about 3 meteTs at fff:0. Therefofe, it can be concluded that cavifation chiofly takeS place at pointS o and Z.

The pTeSent invention has been devised vvith the inten tion of doing aWay vvith such defects. The obiect of the pfeSent invention iS to destToy cavitations by aUfonTatic aHy pouri11g vvatef under pfeSSUTe iI1to the beginning or tfon of the water aSSage in the runnef IneanS accoTding to the degree of cavifation aTonnd the beginning poftion.

In detaiL high preSSUTe Watef is ejected directly into the begnning poftion of the vvater paSSage fTon1 the Sllction pipe WheTe pfeSSufe is highe1 than in said beginning poTtion of the watef aSSa ge. The iI1iected high pfes- S11re water incTeaSeS pTeSSUfe in the beginning poftioI1 of the water passage, and TeduceS the volun1e of wafef StreaII1iI1g in tho beginning poftion ffon1 the Suction poTt, and thefeby deStfoyS cavitationS forIned in the corTent lIpstfeaIn of the eiectioI1 port. FurthefInofe, the voloIne of water under preSSUfe to be eiected iS antofnaticany controlled in feSponSe to the degfee of the occuTfence of cavitation of the degfoe of pfeSSufe reduction, Therefofe, cavitation can be atltonTatically and oonlpletely deStToyed, and thereby the Ump charactefisticS afe femarkably bettered,

ConSeqUently, the pfesent invention can pTovide a veStco pun1p faf Snanef in size and vvith laTgef head than conventional ones.

An eInbodiment of the pfeSent invention Will be eX plained iI1 Tefefence to the dfavvi11gs, in vvhich,

FIG. 1 iS a Side elevational vievv of a vVestoo pun1p 3,233,551 Pafenfed Feb. 8, 966

eInbodyi11g the pTesent invention With itS casing cover and Tunnef fen10ved;

FGl 2 iS a side elevational view paftly in section of the San1e vVith ifS casing feI1oved; and

FIG. 3 iS a diagran1 Shovving Sfatio pTeSSufe dieTenceS betvveen Sofne Static pfeSSUfe nleaSuTing oints in the beginning poftion of the water paSSage and the suction )oft of a conventional vVestco puInp eInploying the diS chaTge head aS a pafaInefef.

A funnef Z is fotatively suppofted within the pllnp casing 1. The TunneT Z is Inounted not rotatively bUt nova bIy in the aXial difections on a TotaTy Shaft 3 extending vithin the caSing 1. In the cifcHInfefential portions of the opposite Sides of the Tunner Z a nuInber of tooth SpaceS aTe fofII1ed fo pfovide bladeS. FuTther in the runnef 2 a pll1rality of balance holes s aTe pTovided Which extend thefethrough. The balance holes 5 o eT- ate aS cifcI11ation holes to SnbstantiaHy equalize vvatef preSSuTeS on the opposite sides of the ronnef 2 `Il1 Inefal o iS a seali11g nleanS to Sea1 the cleaTance betvveen the Casing 1 and the fotaTy Shaft 3. In genefaL me chanical sealS afe eInployed fof this pUTpose, In the innef Wan of Said caSing 1 a fing Shaped watef paSSage 7 iS forn]ed opposite to the tooth Spaces 4 of the funner 2. The beginning poftion 8 and the endiI1g poftion 10 of the vvatef pasSage 7 afe i11 conTInunicafiof1 K/ith a SI1ction pipe 9 and a diScharge pipe 11, feSpectively. A Sinlilar vatef paSSage 7 iS foTTIed in the ffont covef of the caSing 1 (not Shown). Betvveen the beginning pof tion 8 and the ending poftion 10 of Said water paSSage 7 there iS xed a paftition wan 12. Numeral 13 indicateS an eiectfon part fof vVater undor preSSUTe loCatod near the beginning portion 8 of the vvater paSSage 7 and coIn Innnicating vvith a bfanch hole 14 forn1ed in the suction pipe by Way of a Water pipe 15. According to the actuaI opefation it is InoSf effective to position the eiec tion poft between the pointS o and o.

when funnef 2 fofateS in the diTecffon of the aTfovv, Water is puInped up. At that tin1e, as Stated above, pTeS Sufe in the be ginning poftion 8 of the vvater paSSage 7 fofn]ing the puInping Space is faf loweT than that in the s11ction pipe The pumped-U vvatef in the suction pi e paSSes thTough the watef pipe f5 and. iS diSchafged out of the ejection poft 13 in a iet1ike Inannef in ac cofdance With the pTeSSI1fo changes to incfeaSe the pfeS sure within the beginning oftion 8, and theTeby to pfe vent the occuTTence of cavifation. As the voIUIne of watef to be ejected ffom the eiection poft 13 vafies With the change of the rotation of the funneT 2 of with the p1 eSSure changeS of the beginning poffion cauSed by the change of vvater head, puInping efIiciency with thiS pump iS Inuch highe1 than that of conventional ZeSfCo pun1pS Whaf is ofaimed is= 1, A 1oun1 con riSing a circular caSing, cfroular Tnnner Tofatively provided vvithin said Casing, a nearly annUlaf spacing fofIned around the periphefy of the Tunner, Said Spacng forIning a punlping oassage, a Suction pfpe opening into fhe casing and coInIT111nicating wifh the umping paSSage, Said SUCtion pipe having an llpSffean Section upSffean1 of ifS opening info Said pL11np ing paSSage, a diSchaTge pipe opening into the casing in Side-by-Side felation with the Suction ipe and commu nicating v/fth the pnfnping paSSage, and abufnlent n1eanS in Said pum ing )aSSage betveen Said diScharge and Suc tion pipeS, n1eans for pfevenfing oavitationS TeSu1ting frofn the preSSure docreaSe in the beginning porfion of Said pUn1 ng paSSage Telative to the proSSufe pfevailing in Said upStream Section by eiecting Watef at Telatively higher pTeSSufe into the said beginning poTtion inclding a vvater i e, one end of which communicates with the um in paSSage in the Said beginning portion theTeof and the otheT end of vVhich coInnfunicateS vvith the pStream Sec 3 tion of said SUction pipe, So that the preSSriZed water enterS the Said beginning poTtion of the pHfnping paSSage in bypaSSing TelafionShip to the now of liquid through Said opening of Said Sucfion pipe into Said puln ing paSSage.

Z. In a regenerative pufnp having a circular CaSing, a runner proVided Vvth radial bfade 11eanS along fhe cifCInfefenCe thereof, Said Tunllef being rotatab y Sup porfed Within Said casing, an annulaf channel being forfned aboUf the )efipheral edge of the TUnner, Said channel forn1ing a puxnpfng chan1ber, a Sucfion condit having an upStfeam Section and in communicafion With Safd un1ping chaInbef through an inIef aperture, a diS charge conduit in communicafion Wh Said Umping Chamber through a dfScharge apertufe, and abutmenf nleans in said punpfng chanbef and located beten Sad dischafge and in1etapftreS,

the ifn foven)ent eSSentiaHy conSiSting of meanS for pfeventing cavitationS in the beginning poftion of Said pumping chambef adoining Said inlet apeffure in the nofnal diIecfin of rotation of Said runner, Which ToSult from the preSSure decreaSe in said beginning porfion elative to fhe preSSufe prevailing in said U Streafn Section, including a by paSS conduit, one end of which iS in con1fnunication with Said beginning poffion and the otheT end of Which com n1unicafeS vVith Said upStrealn Section of the SUction conduit whereby preSSuriZed wafer iS S11pplied ffom Said upstfeaIn Section difectly to Said beginning of tion of the pun1ping chan1ber to ConpenSate for Said preSSufe decreaSe.

3. A Tegenerative pun1p, con1priSing a cifculaf caSing, a cifcu!ar funnef pTovided with periphefal blade neans and fofafably SUpporfed Vvithin the CaSing wfth a neafly annUlar pHmping chamber fofI1Ted Within Sad casing about the periphefy of the blade InoanS of Said rnner, a SLlction conduft having an UpSfrean1 poftion opening into the caSfng and cofnn1unicating vVith Said pumping chan1ber thfough an inlet apeftufe, a diSchafge conduit opening into the caSing aIld con1nlunicating Wifh Said punfpfng chanbef through a diSC lfafge apeftufe located downSffeam of Said punoing ChaInber, abntlnent n1eanS in Said pnTp ing Chamber internTediate said diScharge apeftUfe an inlet aperfure, and meanS fof Supplying wafef at TeIatve]y highef pfeSSUfe from the llpStrean1 poftion of said Snction conduit to the beginning porfion of Said pl1nping chanTber diSpoSed close to and downStream of Said inlet porti()n fo rovenf CavitationS cauSed by the pfeSSufe decfease in Said beginning poftion Telative to the pfSSure pfevailing in Said upSfTean1 poftion incudng a11Xiliafy conduit neans opefatvely connected vVith one end thefeof wfth said upStreaTn pOTtion and in difect coInInUniCation at the other end theTeof with the beginning poftion of Said Ufnping chalnbeT Where cavitations rnight OccuT RefefenceS Cifed by the Xanfne UNITED STATES PATENTS ))NLEY I. SToCKING, Pm Exm,

IOSEPH H. BRANSON, R KARL I. ALBRECHT, 

1. A PUMP COMPRISING A CIRCULAR CASING, A CIRCULAR RUNNER ROTATIVELY PROVIDED WITHIN SAID CASING, A NEARLY ANNULAR SPACING FORMED AROUND THE PERIPHERY OF THE RUNNER, SAID SPACING FORMING A PUMPING PASSAGE, A SUCTION PIPE OPENING INTO THE CASING AND COMMUNICATING WITH THE PUMPING PASSAGE, SAID SUCTION PIPE HAVING AN UPSTREAM SECTION UPSTREAM OF ITS OPENING INTO SAID PUMPING PASSAGE, A DISCHARGE PIPE OPENING INTO THE CASING IN SIDE-BY-SIDE RELATION WITH THE SUCTION PIPE AND COMMUNICATING WITH THE PUMPING PASSAGE, AND ABUTMENT MEANS IN SAID PUMPING PASSAGE BETWEN SAID DISCHARGE AND SUCTION PIPES, MEANS FOR PREVENTING CAVITATIONS RESULTING FROM THE PRESSURE DECREASE IN THE BEGINNING PORTION OF SAID PUMPING PASSAGE RELATIVE TO THE PRESSURE PREVAILING IN SAID UPSTREAM SECTION BY EJECTING WATER AT RELATIVELY HIGHER PRESSURE INTO THE SAID BEGINNING PORTION INCLUDING A WATER PIPE, ONE END OF WHICH COMMUNICATES WITH THE PUMPING PASSAGE IN THE SAID BEGINNING PORTION THEREOF AND THE OTHER END OF WHICH COMMUNICATES WITH THE UPSTREAM SECTION OF SAID SUCTION PIPE, SO THAT THE PRESSURIZED WATER ENTERS THE SAID BEGINNING PORTION OF THE PUMPING PASSAGE IN BY-PASSING RELATIONSHIP TO THE FLOW OF LIQUID THROUGH SAID OPENING OF SAID SUCTION PIPE INTO SAID PUMPING PASSAGE. 